Adding CSharpUseAnotherLiteralCodeFixProvider

src/Features/CSharp/Portable/CSharpFeaturesResources.Designer.cs

@@ -1243,6 +1243,15 @@ internal class CSharpFeaturesResources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Use &apos;{0}&apos;.
+        /// </summary>
+        internal static string Use_0 {
+            get {
+                return ResourceManager.GetString("Use_0", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Use explicit type.
         /// </summary>

src/Features/CSharp/Portable/CSharpFeaturesResources.resx

@@ -572,4 +572,7 @@
   <data name="Remove_unused_variables" xml:space="preserve">
     <value>Remove unused variables</value>
   </data>
+  <data name="Use_0" xml:space="preserve">
+    <value>Use '{0}'</value>
+  </data>
 </root>
\ No newline at end of file

src/Features/CSharp/Portable/UseAnotherLiteral/CSharpUseAnotherLiteralCodeFixProvider.cs

+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Immutable;
+using System.Composition;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.CodeActions;
+using Microsoft.CodeAnalysis.CodeFixes;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Editing;
+using Microsoft.CodeAnalysis.Text;
+
+namespace Microsoft.CodeAnalysis.CSharp.UseAnotherLiteral
+{
+    [ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.UseAnotherLiteral), Shared]
+    internal sealed class CSharpUseAnotherLiteralCodeFixProvider : CodeFixProvider
+    {
+        private const string CS8313 = nameof(CS8313); // A default literal 'default' is not valid as a case constant. Use another literal (e.g. '0' or 'null') as appropriate. If you intended to write the default label, use 'default:' without 'case'.
+        private const string CS8363 = nameof(CS8363); // A default literal 'default' is not valid as a pattern. Use another literal (e.g. '0' or 'null') as appropriate. To match everything, use a discard pattern 'var _'.
+
+        public override ImmutableArray<string> FixableDiagnosticIds { get; } =
+            ImmutableArray.Create(CS8313, CS8363);
+
+        public override FixAllProvider GetFixAllProvider()
+        {
+            // This code fix addresses very specific compiler errors. It's unlikely there will be more than 1 of them at a time.
+            return null;
+        }
+
+        public override async Task RegisterCodeFixesAsync(CodeFixContext context)
+        {
+            var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
+            var token = syntaxRoot.FindToken(context.Span.Start);
+
+            if (token.Span == context.Span &&
+                token.IsKind(SyntaxKind.DefaultKeyword) &&
+                token.Parent.IsKind(SyntaxKind.DefaultLiteralExpression))
+            {
+                var defaultLiteral = (LiteralExpressionSyntax)token.Parent;
+                var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken).ConfigureAwait(false);
+
+                var constant = semanticModel.GetConstantValue(defaultLiteral, context.CancellationToken);
+                if (!constant.HasValue)
+                {
+                    return;
+                }
+
+                var newLiteral = SyntaxGenerator.GetGenerator(context.Document).LiteralExpression(constant.Value);
+
+                context.RegisterCodeFix(
+                    new MyCodeAction(
+                        c => FixAsync(context.Document, context.Span, newLiteral, c),
+                        newLiteral.ToString()),
+                    context.Diagnostics);
+            }
+        }
+
+        private static async Task<Document> FixAsync(Document document, TextSpan span, SyntaxNode newLiteral, CancellationToken cancellationToken)
+        {
+            var syntaxRoot = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
+
+            var defaultToken = syntaxRoot.FindToken(span.Start);
+            var defaultLiteral = (LiteralExpressionSyntax)defaultToken.Parent;
+
+            var newRoot = syntaxRoot.ReplaceNode(defaultLiteral, newLiteral.WithTriviaFrom(defaultLiteral));
+            return document.WithSyntaxRoot(newRoot);
+        }
+
+        private sealed class MyCodeAction : CodeAction.DocumentChangeAction
+        {
+            public MyCodeAction(Func<CancellationToken, Task<Document>> createChangedDocument, string literal)
+                : base(string.Format(CSharpFeaturesResources.Use_0, literal), createChangedDocument, CSharpFeaturesResources.Use_0)
+            {
+            }
+        }
+    }
+}

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.cs.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.de.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.es.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.fr.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.it.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.ja.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.ko.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.pl.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.pt-BR.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.ru.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.tr.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.zh-Hans.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/CSharp/Portable/xlf/CSharpFeaturesResources.zh-Hant.xlf

@@ -107,6 +107,11 @@
         <target state="new">Sort accessibility modifiers</target>
         <note />
       </trans-unit>
+      <trans-unit id="Use_0">
+        <source>Use '{0}'</source>
+        <target state="new">Use '{0}'</target>
+        <note />
+      </trans-unit>
       <trans-unit id="if_statement_can_be_simplified">
         <source>'if' statement can be simplified</source>
         <target state="new">'if' statement can be simplified</target>

src/Features/Core/Portable/CodeFixes/PredefinedCodeFixProviderNames.cs

@@ -54,6 +54,7 @@ internal static class PredefinedCodeFixProviderNames
         public const string Suppression = nameof(Suppression);
         public const string AddOverloads = nameof(AddOverloads);
         public const string AddNew = nameof(AddNew);
+        public const string UseAnotherLiteral = nameof(UseAnotherLiteral);
         public const string UseImplicitType = nameof(UseImplicitType);
         public const string UseExplicitType = nameof(UseExplicitType);
         public const string UseCollectionInitializer = nameof(UseCollectionInitializer);

src/Test/Utilities/Portable/Traits/Traits.cs

@@ -122,6 +122,7 @@ public static class Features
             public const string CodeActionsSimplifyTypeNames = "CodeActions.SimplifyTypeNames";
             public const string CodeActionsSpellcheck = "CodeActions.Spellcheck";
             public const string CodeActionsSuppression = "CodeActions.Suppression";
+            public const string CodeActionsUseAnotherLiteral = "CodeActions.UseAnotherLiteral";
             public const string CodeActionsUseInterpolatedVerbatimString = "CodeActions.UseInterpolatedVerbatimString";
             public const string CodeActionsUseAutoProperty = "CodeActions.UseAutoProperty";
             public const string CodeActionsUseCoalesceExpression = "CodeActions.UseCoalesceExpression";